From eb8b3c2b07a761fdb3fcb6f7e39679ccfba595a6 Mon Sep 17 00:00:00 2001 From: Jean-Marc Valin Date: Mon, 23 Apr 2012 16:24:45 -0400 Subject: Adds note on monic filter --- silk/fixed/noise_shape_analysis_FIX.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'silk/fixed') diff --git a/silk/fixed/noise_shape_analysis_FIX.c b/silk/fixed/noise_shape_analysis_FIX.c index 8a3d7ccb..d8459ae7 100644 --- a/silk/fixed/noise_shape_analysis_FIX.c +++ b/silk/fixed/noise_shape_analysis_FIX.c @@ -34,6 +34,9 @@ POSSIBILITY OF SUCH DAMAGE. /* Compute gain to make warped filter coefficients have a zero mean log frequency response on a */ /* non-warped frequency scale. (So that it can be implemented with a minimum-phase monic filter.) */ +/* Note: A monic filter is one with the first coefficient equal to 1.0. In Silk + we omit the first coefficient in an array of coefficients, for monic filters. +*/ static inline opus_int32 warped_gain( /* gain in Q16*/ const opus_int32 *coefs_Q24, opus_int lambda_Q16, -- cgit v1.2.3